Refrigerating apparatus.



No. 796,969. PATENTED AUG. 8, 1905.

W. O. HIBSTER.

REFRIGERATING APPARATUS. APPLICATION FILED FEB. 9. 1905.

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w. 0. HIESTER.

REFRIGERATING APPARATUS.

APPLICATION FILED FEB. 9. 1905.

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REFRIGERATING APPARATUS.

APPLICATION FILED FEB. 9, 1905.

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' atbozne a UNITED STATES PATENT OFFICE.

REFRIGERATING APPARATUS- Specification of Letters Patent.

Patented Aug. 8, 1905.

Continuation of application Serial No. 157,027, filed May 14,1903. This application filed February 9, 1905. Serial No. 244.883 (Model) To all whom it may concern:-

Be it known that 1, WILLIAM C. HIESTER, a citizen of the United States, residing at Dayton, in the county of Montgomery and State of Ohio, have invented certain new and useful Improvements in Refrigerating Apparatus, of which the following is a specification.

This invention relates to refrigerating devices, and especially relates to that class of motor-driven refrigerating devices in which the motive power is water at the ordinary temperature.

The object of the invention is to provide a simple and effective refrigerating device in which uniform temperature may be maintained and the condensing effected by the water which drives the motor, which is so constructed as to combine in one device a condenser and motor.

A further object of the invention is to provide means by which the machine is automatically regulated,so as to secure the pro per condensation of the liquid. as well as the proper vaporization of the liquid in the refrigeratingpipes.

The invention consists of the Various constructions and combinations hereinafter described, and pointed out in the claims.

In the drawings, Figure 1 represents a refrigerating device to which my apparatus is shown attached. Fig. 2 is a sectional view of the same, showing the general arrangement of the apparatus. Fig. 3 is a longitudinal sectional view of the motor and pump. Fig. 4: is a transverse sectional view of the motor and condenser. Fig. 5 is a transverse sectional view of the vacuum-regulator. Fig. 6 is an elevation of the same. Fig. 7 is a plan view of the combined motor'and condenser, and Fig. 8 is a detail of same.

Like parts are represented by similar letters of reference in the several views.

The pump and condensing-motor are preferably mounted on the same bed a, the motor being arranged at one end and the pump at the other. The pistons of the pump and motor I have shown with a piston-rod a, common to both, and the pump is driven thereby in a well-known manner, the usual connections being shown to operate the motor-valve a by the movement of the piston-rod. Water under pressure is taken from any convenient source of supply and conveyed directly to the motor through a supply-pipe 6 (shown in Fig. 4c) and after passing through the motor, which may be of the usual type,is discharged through a pipe 6 The motor is provided with a jacketed cylinder, which preferably consists of a copper tube Z)", inserted into the outer casing, which may be of cast-iron, so as to form a very thin metallic cylinder with a cylindrical space surrounding it in the nature of a jacket, through which the compressed vapors are passed for condensation in the manner hereinafter specified. The pump is connected to this combined condenser and motor through a pipe 6 and the discharge is from the condenser through a pipe 5' into a storage-reservoir 6". From the storage-reservoir the liquid passes to the expansion-valve c and from the expansion-valve into a pipe 0, which leads to the refrigerating-chamber and preferably into a coil of pipe the opposite extremity of which is connected by a pipe 0 to thesupply side of the pump. The cooling or refrigerating pipes may be placed directly in the refrigerator or they may be inclosed in a separate chamber and surrounded by brine in the usual way, in which cans may be placed, if desired, for freezing, such 'cans being illus trated in Fig. 2.

The pumpfmay be of any type, but is preferably formed with inlet and outlet valvesf and f and is provided with pipes f and f, said pipes being connected with the pipes 6 and 0 as shown, so as to form a double-acting pump. It is further provided with a jacketed cylinder through which water or other cooling liquid may be used to prevent the overheating of the parts of the pump. A chamber f having inlet and outlet pipes f, is shown for this purpose.

The operating-valve is preferably located in close proximity to the condensing-chamber. The pipe 6 leads into a chamber 6, having openings 6 to the atmosphere, and in this chamber is located an automatic screw-valve e, which is adapted to open and close the passage between the chamber 6 and the condensing-chamber formed about the motor-cylinder. The valve 6 is normally closed by a weight 6 and is opened by the pressure of the vapor on the inner side of a diaphragm 0, arranged within the chamber 0, the weight being adjustable to regulate the pressure to any point desired to secure the necessary compression from the pump. When the compression is effected by means of the pump, the pressure acting on the diaphragm operates levers e and e to open the valve 0 and permits the compressed vapor to pass into the condenserchamber. The cooled liquid resulting from the condensed vapors is then stored in a storage-tank b and by its own natural pressure, due to its temperature, passes to the coolingchamber 0 of the expansion-valve. This expanion-valve is of novel construction. It is formed with an outer cooling-chamber 0 and an inner expansion-chamber 0. The liquid is admitted to the outer cooling-chamber and is permitted to expand into the expansion-chamber through a valve-c The supply side of the pump being connected directly to the refrigerating-pipes a vacuum is formed in said pipes, and this vacuum extends into the expansion-chamber 0. Connected with the expansion-chamber 0* is a diaphragm-chamber 0, in which is placed a diaphragm connected to one end of a weighted lever 0 which lever is also connected by levers 0 and a to the screw-valve 0 A weight 0 on the weighted lever tends to close the valve 0 The upper part of the diaphragm-chamber is open to the atmosphere, the opposite side of the diaphragm-chamber being open to the expansionchamber. As the vacuum is formed in this chamber the atmospheric pressure tends to open the valve, and so long as there is a partial vacuum in the expansion-chamber this valve will remain open, and the degree of vacuum to be maintained may be regulated by the weight d. The expansion of the liquid at this point produces the cold, and this intense cold in the expansion-chamber cools the incoming liquid surrounding it, and this has a tendency to reduce still lower the temperature secured at the expansion-point and effects a saving in the operation of the apparatus by further reducing the temperature of the cooling liquid before it is expanded.

Any desired means may be provided for circulating the brine in the refrigerating-chamber, if such is employed.

By the arrangement shown the regulation of the vapor is effected wholly by the vacuum in the vacuum-chamber. If the vacuum is in creased, an additional supply of the liquid is admitted to compensate for it, andvice versa.

It will be seen that the valve which regulates the compression is a pressure-valve and that the valve which regulates the vaporforming device is a vacuum-valve.

I have shown both the pressure and the vacuum valves screw-threaded and operated by a partial turning of same, so that they will not jump with the impulse from the pump, as would be the case with a sliding valve, and

thus I obtain an even accurate regulation. The refrigerating medium will readily pass through a very limited opening, and sufficient pitch is given the screw to give the valve the required opening by a partial turning of same.

Before charging the machine with the refrigerating medium an air-valve 6 is opened and the motor started. When a vacuum has been created, the air-valve and a cut-off valve 6 are closed, and a charging-valve 6 having a connection to the supply, (not shown,) is opened. The continued operation of the motor will pump the refrigerating medium from the supply into the machine, and when a sufficient quantity is obtained the valve 6 is closed and the valve 6 is opened.

It will be seen that I have so improved, reduced, and simplified the several parts of the apparatus that it can be arranged, as a whole, in a portable form, as shown in Figs. 1 and 2. In so simplifying and arranging the apparatus as to make it portable the range of its usefulness is not only greatly enlarged, but the cost of production is materially lessened. The walls of the casing about the refrigerating chamber are provided with ai r-chambers g,and a separate chamber 9 is provided for the reservoir, and the pump and the combined motor and condenser having a bed-plate common to both mounted on top of the casing form a compact and substantial arrangement. A door g gives access to the refrigerating-chamber, and gages b and c on the pipes and 0 enable the operator to properly adjust the pressure and vacuum valves. A glass gage b on the reservoir will show the quantity of liquid in the reservoir.

Having thus described my invention, I claim 1. In a refrigerating device,-the combination with a pump, a refrigerator and a connection from the inlet of said pump to said refrigerator, of a water-motor adapted to drive said pump having a shell forming its cylinderbore with an annular chamber formed around said shell for condensing the refrigerating medium, said condensing-chamber having connections from the outlet of said pump and to said refrigerating-chamber, and an automatic vacuum-valve in the connection from the condensing-chamber to said refrigerator, substantially as specified.

2. In a refrigerating apparatus, the combination with a pump, a refrigerator and a connection from the inlet of said pump to said refrigerator, of a Watermotor adapted to drive said pump having a shell forming its cylinder-bore with a chamber formed around said shell for condensing the refrigerating medium, said condensing-chamber having connections from the outlet of said pump and to said refrigerator, a valve in the connection from said pump and a valve in the connection to In testimony whereof I have hereunto set my hand this 19th day of January, A. D. 1905.

WILLIAM C. HIESTER.

Witnesses:

CHAs. I. WELOH, F. LLEWELLYN WALKER. 

